I'm suppose to simulate a differentiator circuit and compare it to calculated results. My problem is, I have trouble simulating the circuit on pspice. I'm suppose to use an LM741. I found the part in the OPAMP.olb file. However, the part cannot be used for simulation; it doesn't have the pspice icon that shows it can be used for simulation. How do I fix this? On a side note, I found a different part that can be simulated which is the ua741. Is the ua741 equivalent to the LM741?